Diffusion and microrheology of dense liposome suspensions*

Phospholipid vesicles can be stabilized against fusion, up to volume fraction around 80{\%}, which is accomplished by studding the outer leaflet with charged nm-sized particles. The diffusion of such soft, flexible and hollow objects is revealed by single-particle tracking. Image analysis of time trajectories, obtained using epifluorescence imaging, was performed at sub-pixel resolution. This poster will reveal aspects of curiously heterogeneous dynamics and also quantification of microrheology in this system. Taken together, this system of charged, polydisperse, flexible objects displays rich dynamics that contrasts acutely with known behavior for hard-sphere dense particle systems.